import {
  Injectable,
  NestInterceptor,
  CallHandler,
  ExecutionContext,
} from '@nestjs/common';
import { map } from 'rxjs/operators';
import { Observable } from 'rxjs';
import { Model } from 'mongoose';

// response
interface Response<T> {
  data: T;
}
const handleResponseData = <T>(value: T) => {
  return { data: value, code: 0, message: '请求成功'};
};

@Injectable()
export class TransformHttpInterceptor<T> implements NestInterceptor<T, Response<T>> {
  intercept( context: ExecutionContext, next: CallHandler<T>): Observable<Response<T>> {

    return next.handle().pipe(
      map((data) => handleResponseData(data)),
    );
  }
}
